Ok so I have a 3g iPhone and its on the 3.0 firmware. I jail-broke it using redsnow, then unlocked it with ultrasn0w (and I made sure 3g was off). Then I put my sim card in and it works. But then later on after I start syncing stuff from itunes or downloading stuff from cydia when some one calls my cell it goes to my voice mail. I can make calls but just not receive them. I have tmobile, not data plan. So does the new itunes mess things up? Am I not doing something right? Could it be that i've had this sim card for 5 years and need a new one? Should I contact T-Mobile? Any help would be really really great!